<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    h2 {
      text-align: center;
    }

    .box {
      width: 600px;
      margin: 50px auto;
      display: flex;
      font-size: 25px;
      line-height: 40px;
    }

    .qs {

      width: 450px;
      height: 40px;
      color: red;

    }

    .btns {
      text-align: center;
    }

    .btns button {
      width: 120px;
      height: 35px;
      margin: 0 50px;
    }
  </style>
</head>

<body>
  <h2>随机点名</h2>
  <div class="box">
    <span>名字是：</span>
    <div class="qs">这里显示姓名</div>
  </div>
  <div class="btns">
    <button class="start">开始</button>
    <button class="end">结束</button>
  </div>
  <script>
    // 数据数组
    const arr = ['马超', '黄忠', '赵云', '关羽', '张飞']
    console.log(arr);
    //获取数组
    const qs = document.querySelector('.qs')
    const start = document.querySelector('.start')
    const end = document.querySelector('.end')
    let timerId = 0
    let random = 0


    start.addEventListener('click', function () {
      timerId = setInterval(function () {
        random = Math.floor(Math.random() * arr.length)
        qs.innerHTML = arr[random]
        if (arr.length === 1) {
          start.disabled = end.disabled = true
        }
      }, 100)


    })
    end.addEventListener('click', function () {
      clearInterval(timerId)
      arr.splice(random, 1)
      console.log(arr);

    })



  </script>


</body>

</html>